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  1. D

    Max Zs permitted values..

    Hi guys n gals think I messed up my last post as it be gone... Anyhow got a question C32 30Ma 10k RCBO on a standard final ring with the same supply characteristics as ANOTHER final ring off the Db 6 inches from it... Live been going through the O/M manual and found the test sheets and these 2...
  2. L

    max zs table in the osg

    Hi all sorry for this silly question but i cant seem to find the max Zs table for a 10A BS88-2 Fusein the osg. I can find it in the BGB table 41.4 10A = 7.19 ohms and i know to multiply it by 0.8 (7.19 x 0.8 = 5.75) for rule of thumb but i would like to find the right table in the osg
  3. beatboaby924y

    61009 rcbo max zs 1667ohms?

    Doing some testing today and came across something I was hoping to get cleared up. The maz zs of a c type 16amp 61009 is 1.44 ohms on table 41.3 however on table 41.5 it states that a 30ma 61009 under 32amp can have max zs of 1667ohms. Would you write on test sheet maz zs 1667 ohms and...
  4. dlt27

    Max Zs for TT.

    Don't know if I'm being a proverbial div, but could someone tell me the max Zs for 80A 1361( distribution cct )on a TT system with disconnection time of 1.0 sec. Thanks.
  5. Clark3169

    NICEIC Certification Scheme Max ZS allowed on NICEIC cert seems wrong?

    Hi guys. I've recently moved from NAPIT to NICEIC I've just issued a cert. Now the circuit details are as follows. Lighting, 6amp RCBO Ze - 0.18 R1&R2 - 0.64 ZS - 0.82 Now by my understanding the max allowed ZS is 6.14 for the type of RCBO so I'm well within the allowed but on the generated...
  6. J

    Max number of sockets allowed on a radial circuit in order to comply?

    Hi all, Just wondering if anybody knew why the max number of sockets you can have on a radial circuit covered by a 20amp breaker, and fed by 2.5 T&E in order to comply with regs? Cheers
  7. S

    Max length

    Need power to shed .thinking of a spur from 32a ring as only want 1double socket and light is there a max length for a this
  8. D

    Exceeding max zs values on caravan site? With pme supply

    Hi all, first post on the forum and I hope you's can help me with a few questions I have. I have been asked to test a caravan site with the following details pme supply (with no individual spikes at hook up points) main 400a mccb with bolt on adjustable rcd(turned in the off position)i. I have...
  9. Pete999

    Fat Max

    Just had a delivery, and wondered if anyone has seen the new FatMax folding chisel send a picture after my tea
  10. infinity

    solar max going bust

    I had an email today from spitfire selling off the 15kw inverter cheap, then find out solar max are going bust I find it disgusting that a wholesaler throws an offer out knowing the manufacturer is going bust completely leaving the installed in the brown stuff!
  11. J

    Max floor area for industrial and commerical sockets?

    I am fully aware of A1, A2 and A3 ring circuits, but does this apply for all installations or just domestic? If so what are the regulations on the other two. I'm looking for the most efficient way to wire two floors of offices and a workshop next to it for an assignment.
  12. R

    help required - max demand after diversity 100a with a 100 distribution board

    Hi, i am attempting to do the 2396 exam and in the process of doing a practice paper. Qu. A distribution circuit is to be installed using a new three-phase and neutral 100A distribution board within an industrial installation. assumed demand per phase is 100A following the application of...
  13. V

    Max Zs MCCB

    Hi all was just looking to know does anyone know the max Zs for a 250-400 amp MCCB I can't find it anywhere in BS7671
  14. S

    max demand

    went to domestic job today where max demand was 236A (around 175A after diversity) main fuse is 100A so demand seems high to me...just wondered when you design what demand do you go to
  15. spud1

    Which Max EFL table to use for a BS EN 60947-3 MCCB?

    Hi which maximum permitted EFL table should I use for a BS EN 60947-3 MCCB? Is it table 41.3 BS7671?
  16. M

    Max ze values

    This may sound like a daft question but in bs 7671 does it state anywhere in it about max ze values ie tncs--0.35 tns--0.80 tt--21 I was jut wondering,I can find max zs but not ze ?????
  17. V

    16A c 60898-1 tp mcb max zs @ 80%

    hi all does anyone know where I can find chart for 60898-1 (ie 3 phase) mcbs showing the 80% of max like we have for single phase mcb's. im slightly confused by bs 7671 no showing anything other than uo 230v....or am I treating each phase of a mcb as 230v. all advice gratefully accepted ta...
  18. M

    Max number sockets

    Is 5amp sockets classed same as light fixture. As in 100w each and max 13 per 6 amp. Cheers
  19. W

    mccb Max zs 80% rule

    Hi all I have an EICR underway and have to compare some ZS values for readings on some circuits protected by MCCB's i have the manuf instructions with the max ZS values for the devices but do they have to be measured against the 80% value similiar to MCB's? doesnt say anything in the...
  20. W

    Testing 110v/ac and Filling in EIC forms and max fault currents

    Hi all I am currently testing a lot of 110v/ac circuits. These are fed from a db which is supplied by a 110v transformer. the MCB's are double pole 6a 60947 schnieder. My questions are: 1. What is the max zs for the device? 2. do I need to put anything special on the eic forms Thanks

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